NDLI: Performance of MnO$_{2}$ Crystallographic Phases in Rechargeable Lithium-Air Oxygen Cathode

Content Provider	Springer Nature Link
Author	Oloniyo, Olubukun Kumar, Senthil Scott, Keith
Copyright Year	2012
Abstract	Manganese dioxide (MnO$_{2}$) has been shown to be effective for improving the efficiency of cathodes in lithium-air cells. Different crystallographic phases including α-, β-, and γ-MnO$_{2}$ nanowires, α-MnO$_{2}$ nanospheres, and α-MnO$_{2}$ nanowires on carbon (α-MnO$_{2}$/C) were synthesized using the hydrothermal method. Their physical properties were examined using x-ray diffraction (XRD), Brunauer–Emmett–Teller (BET) surface area measurements, and scanning electron microscopy (SEM) and found to be in agreement with the literature. Electrochemical properties of the synthesized catalyst particles were investigated by fabricating cathodes and testing them in a lithium-air cell with lithium hexafluorophosphate in propylene carbonate (LiPF$_{6}$/PC) and tetra(ethylene glycol)dimethyl ether (LiTFSi/TEGDME) electrolytes. α-MnO$_{2}$ had the highest discharge capacity in the LiTFSi/TEGDME electrolyte (2500 mAh/g), whilst α-MnO$_{2}$/C in LiPF$_{6}$/PC showed a significantly higher discharge capacity of 11,000 mAh/g based on total mass of the catalytic cathode. However, the latter showed poor capacity retention compared with γ-MnO$_{2}$ nanowires, which was stable for up to 30 cycles. The reported discharge capacity is higher than recorded in previous studies on lithium-air cells.
Starting Page	921
Ending Page	927
Page Count	7
File Format	PDF
ISSN	03615235
Journal	Journal of Electronic Materials
Volume Number	41
Issue Number	5
e-ISSN	1543186X
Language	English
Publisher	Springer US
Publisher Date	2012-04-04
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Lithium-air rechargeable cell manganese dioxide catalyst discharge capacity cyclability Solid State Physics Characterization and Evaluation of Materials Optical and Electronic Materials Electronics and Microelectronics, Instrumentation
Content Type	Text
Resource Type	Article
Subject	Materials Chemistry Electronic, Optical and Magnetic Materials Condensed Matter Physics Electrical and Electronic Engineering

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